While it sucks we can't get them blacklisted, I'm pretty sure we've already ruled out the "nuke the tags" and "use a dummy tag" options, and we're trying to deal with "disambiguatewe've already had stabs at disambiguating the tags"tags (without enumerating every single question):
Nuke the tags
Nuking the tag seems to be the worst of these options: while we'd have lower number of questions with onerous tags on them, we'd have several hundred questions with no career-related tag floating out there, without any way to track them. It "solves" the problem of the tag being available to users < 1,500 rep, but it doesn't actually deal with the questions or tag them correctly.
Disambiguate the tags
We already have lists of tags that need dealing with: the tag pages. We need people to use their best judgement while working through those tags to clean them up. That's what we're currently doing. Manually relisting all the questions in the tags just to avoid a blacklist seems to me to be a non-starter.
Rename the tags
Conclusion
If these are our only options, disambiguating the tags ason the flay—as we've been doing stilldoing—still seems to be the least onerous of the three. I'd be okay with renaming the tags to some master crap tag and working through that tag in the same manner as we've been doing, but I don't see how that's any less disruptive to the user experience than just blacklisting [career] and [jobs].